Do Massless Particles Travel at Light Speed?

In summary, massless particles do not have any rest mass but only have energy and momentum. They all travel at the speed of light in a vacuum and cannot travel slower than this speed. The speed of light is a fundamental constant related to the properties of massless particles and is explained by Einstein's equation. While there are theories about particles traveling faster than light, they have not been proven.
  • #1
jayaramas
30
0
do all mass less particles travel at the speed of light?
 
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  • #2
Yes.
 
  • #3
Doc Al said:
Yes.

Why?
 
  • #4
Why?

PHRAK...Stop teasing Doc Al!

Best answer I know: that's what we observe.
 
  • #5
But I was just getting started...

First we have "particles" and they're "moving", and this is supposed to be physics 200 years after Newton.
 

1. What are massless particles?

Massless particles are particles that do not have any rest mass, meaning they do not have any physical weight or mass at rest. They only have energy and momentum, which are related to their frequency and wavelength.

2. Do all massless particles travel at light speed?

Yes, all massless particles, including photons, travel at the speed of light in a vacuum. This is because they do not have any rest mass and therefore do not experience any resistance to acceleration.

3. Can massless particles travel slower than the speed of light?

No, massless particles can only travel at the speed of light in a vacuum. This is a fundamental principle of physics known as the constant speed of light.

4. How is the speed of light related to the properties of massless particles?

The speed of light is a fundamental constant in the universe and is the maximum speed at which any particle, including massless particles, can travel. This is due to the relationship between energy, mass, and speed described by Einstein's famous equation, E=mc².

5. Are there any exceptions to massless particles traveling at light speed?

There are some theories that suggest the existence of particles called tachyons, which travel faster than the speed of light. However, these theories have not been proven and are not widely accepted in the scientific community.

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